If your business has taxable turnover exceeding S$1 million in Singapore, you may need to register for Goods and Services Tax (GST). However, GST registration in Singapore depends on your taxable business turnover, rather than simply the total amount of revenue or money your business receives.
Understanding the registration threshold, eligibility criteria and application deadlines can help you stay compliant with the Inland Revenue Authority of Singapore (IRAS).
In this guide, we explain when GST registration is compulsory, how the S$1 million threshold works, and what business owners should do if they reasonably expect their taxable turnover to exceed this threshold in the next 12 months.
What Is GST Registration in Singapore?
Goods and Services Tax (GST) is a consumption tax imposed on most goods and services supplied in Singapore, as well as certain imported goods and services. GST also applies to certain imported services under specific rules.
Businesses that are registered for GST generally need to charge GST on their standard-rated supplies, collect the tax from customers and submit GST returns to IRAS. They may also claim eligible GST incurred on business purchases and expenses, subject to the relevant rules.
Singapore’s prevailing GST rate is 9%.
For businesses, GST registration Singapore requirements are particularly important because compulsory registration generally applies when annual taxable turnover exceeds S$ 1 million at the end of the calendar year (retrospective basis) or when the business reasonably expects its taxable turnover to exceed S$ 1 million in the next 12 months (prospective basis).
Do I Need to Pay GST If I Earn S$1 Million in Singapore?
The short answer is: You may be required to register for GST if your taxable business turnover exceeds S$1 million. However, earning 1 million does not automatically mean that you must pay GST on all your income.
IRAS uses two tests to determine whether a business must register for GST.
1. Retrospective Basis: Your Taxable Turnover Exceeds S$1 Million
Under the retrospective basis, you must assess your taxable turnover for the calendar year, from 1 January to 31 December.
If your taxable turnover exceeds S$1 million at the end of the calendar year, you are generally required to apply for GST registration between 1 January and 30 January of the following year. Your GST registration will generally take effect on 1 March of that year.
For example:
- Your taxable turnover for 2026 is S$1.2 million.
- Your turnover exceeds the S$1 million threshold for the calendar year.
- You generally need to apply for GST registration between 1 January and 30 January 2027.
- Your registration will generally take effect on 1 March 2027.
There is an important exception to understand. If your taxable turnover exceeds S$ 1 million during the year or when the business reasonably expects its taxable turnover to exceed S$ 1 million in the next 12 months, you may not need to register immediately. You should assess the applicable retrospective registration rules and any available exemption.
Read More : GST Business Guide: How to Calculate GST
2. Prospective Basis: You Expect to Exceed S$1 Million
You may also be required to register for GST before your annual turnover actually exceeds S$1 million.
Under the prospective basis, compulsory registration applies when there are reasonable grounds to expect that your taxable turnover will exceed S$1 million in the next 12 months.
For example, your business signs a contract worth S$1.5 million, and the contract provides reasonable grounds to expect that your taxable turnover will exceed the threshold during the next 12 months.
In this situation, you may need to register for GST even if your current turnover is below S$1 million.
You must generally apply within 30 days after the date of your forecast. For registration liabilities arising on or after 1 July 2025, IRAS provides a two-month period from the forecast date before GST registration takes effect and the business must begin charging GST, subject to the applicable rules.
Supporting documents may include signed contracts, accepted quotations, confirmed purchase orders and financial records demonstrating the expected taxable turnover.
What Counts as Taxable Turnover for GST Registration?
Not every dollar your business receives counts towards the S$1 million GST registration threshold.
Taxable turnover generally includes the value of taxable supplies made in Singapore in the course of your business.
These supplies include:
- Standard-rated supplies: Most local sales of goods and services, which are generally subject to 9% GST.
- Zero-rated supplies: Qualifying exports of goods and international services, which are taxed at 0% but generally count towards taxable turnover.
Certain transactions are excluded from taxable turnover, including exempt supplies, out-of-scope supplies and the sale of capital assets such as business equipment or office furniture.
For example, if your business earns S$1.2 million from qualifying taxable supplies, you may be required to register for GST. However, if the same amount includes substantial exempt income or the sale of capital assets, the amount used to assess registration liability may be different.
Therefore, you should calculate your taxable turnover carefully instead of relying solely on your total revenue or accounting profit.
What Happens After GST Registration in Singapore?
Once your business is GST-registered, you must comply with the relevant GST requirements from the effective date of registration stated in your IRAS approval letter.
Charge GST on Applicable Sales
You generally need to charge GST at the prevailing rate of 9% on standard-rated taxable supplies made in Singapore.
For example, if you provide a taxable service worth S$10,000 before GST, the invoice would generally be:
- Service fee: S$10,000
- GST at 9%: S$900
- Total payable: S$10,900
The GST collected is tax payable to IRAS, subject to the GST rules and any eligible input tax claims. It is not additional business profit.
File GST Returns
GST-registered businesses must submit GST returns according to their assigned accounting periods, commonly quarterly. Returns must generally be filled, and any GST due paid, within one month after the end of each accounting period.
Even if there are no transactions during an accounting period, you must still submit a NIL GST return.
You should maintain accurate sales invoices, purchase invoices, accounting records and supporting documents to ensure that your GST returns are correct.
Claim Eligible Input Tax
GST registration may also allow your business to claim eligible GST paid on business purchases and expenses.
For example, if your business pays GST on qualifying equipment, professional services or other business expenses, you may be able to claim that GST as input tax, provided the relevant conditions are met.
These conditions include having valid supporting documents, using the goods or services for business purposes, and ensuring that the expenses relate to making taxable supplies or other qualifying supplies.
However, not every business expense qualifies for an input tax claim. Certain expenses, such as private expenses and specified motor car expenses, are generally not claimable.
Eligible input tax can be offset against output tax collected, reducing the net GST payable to IRAS. Depending on the amount of input tax and output tax, your business may instead be entitled to a GST refund.
Can I Avoid GST Registration If My Turnover Is Below S$1 Million?
If your business is not liable for compulsory GST registration, you may choose to register voluntarily, provided that it meets IRAS’s qualifying criteria.
Voluntary registration may be beneficial if your business incurs substantial GST-bearing expenses or mainly serves GST-registered business customers that can claim eligible input tax. This is because your business may be able to recover eligible GST paid on its purchases and expenses, subject to the relevant input tax claiming conditions.
On the other hand, voluntary registration creates additional administrative responsibilities, including GST reporting, record-keeping and compliance obligations. Businesses registered voluntarily generally need to remain registered for at least two years and satisfy the applicable conditions before cancelling their registration. Cancellation is subject to IRAS approval.
Before deciding whether to register voluntarily, you should consider your customer profile, business expenses, cash flow and future growth, as well as whether the benefits outweigh the additional compliance costs.
How to Apply for GST Registration in Singapore
If your business meets the compulsory registration criteria, you must apply for GST registration within the prescribed timeframe. You should first determine whether your registration liability arises under the retrospective or prospective test.
The general process is as follows:
- Calculate your taxable turnover. Review your taxable supplies and determine whether you meet the retrospective or prospective registration criteria.
- Prepare supporting documents. Depending on your circumstances, these may include financial statements, sales records, contracts, quotations and purchase orders.
- Submit your application. Apply through the relevant IRAS GST registration process and provide the required information.
- Monitor your registration status. Check your effective registration date and ensure your invoicing and accounting systems are ready to comply with GST requirements.
- Meet your ongoing obligations. Charge GST where applicable, maintain records, submit returns and pay any GST due on time. You should also check whether your business is required to comply with the GST InvoiceNow Requirement.
You can refer to the official IRAS guidance on whether you need to register for GST: https://www.iras.gov.sg/taxes/goods-services-tax-(gst)/basics-of-gst/goods-and-services-tax-(gst)-what-it-is-and-how-it-works
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